وَدَعَا بِمَا شَاءَ، مِمَّا يُشْبِهُ أَلْفَاظَ الْقُرْآنِ وَالْأَدْعِيَةَ الْمَأْثُورَةَ، وَلَا يَدْعُو بِمَا يُشْبِهُ كَلَامَ النَّاسِ.
Meaning: Then supplicate as desired using formulations resembling Quranic expressions and transmitted supplications, and avoid supplication resembling ordinary human speech.
Al-ad‘iyah al-ma’thurah are established supplications. Kalam al-nas denotes ordinary human discourse outside the character of prescribed worship.